Sheet metal working tool



FIG. 1 is a top plan view of the sheet metal working tool showing my new design;

FIG. 2 is a side elevation view;

FIG. 3 is a side elevation view at a 90° angle to FIG. 2 and;

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a sheet metal working tool, substantially as shown. 